Thank you both!
Sadly I'm very sure the Aura One would be too big for me as a 32 gb reader would be perfect.
But I think the H2O at Argos is the new edition -
http://www.argos.co.uk/product/7507094 (Although they mistakenly say it has an SD card slot so who knows). So I might at least be able to see one in person to see how I find the larger screen.